CAMPBELL BIOLOGY (18W)
12th Edition
ISBN: 9780136858256
Author: Urry
Publisher: PEARSON
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Textbook Question
Chapter 33.5, Problem 2CC
WHAT IF? Ø The insect Drosophila melanogaster and the nematode Caenorhabditis elegans are prominent model organisms. Are these species the most appropriate invertebrates for making inferences about humans and other vertebrates? Explain.
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Assume that you discovered Caenorhabditis elegans that crawl significantly slower than others. How would you determine whether this behavior was due to an injury from the environment or to an inherited trait? A goal of using animal models is to explain the molecular detail of specific behaviors encoded in the human brain. How would you compare the developmental biology experiments on memory and learning using the fruit fly, Drosophila melanogaster, as evidence about the evolution of a human behavior?
14. Nematode Life Cycle Matching: Match each of the descriptions below with the correct nematode
worm species (A-D). Note that some descriptions may not apply to any of the 4 species (in which
case just write “none") and some descriptions may apply to multiple worms species (in which case
write the letters of all applicable species).
(A) Dirofilaria (heartworms) (B) Dracunculus (Guinea worm) (C) Ascaris
(D) Hookworms
1. Life cycle includes only a single host
2. The infective stage is a free-living larva that can enter the skin directly
3. On target to become the first parasite-caused human disease to be eradicated
4. Has an arthropod intermediate host
5. Traditional treatment involves winding the female worm around a matchstick
6. Infections can be prevented by not defecating on soill improving sanitation of soil
7. Female lays eggs around the anus of the host
8. Produce microfilaria that circulate in the blood
9. Has multiple larval stages and a snail intermediate host
10. Migrate…
Thinking Analytically
Do you think there are more species of animals on land or in the ocean? What about absolute numbers of animals—are there more animals on land or in the ocean?
Chapter 33 Solutions
CAMPBELL BIOLOGY (18W)
Ch. 33.1 - Prob. 1CCCh. 33.1 - Prob. 2CCCh. 33.2 - Compare and contrast the polyp and medusa forms of...Ch. 33.2 - VISUAL SKILLS Use the cnidarian life cycle...Ch. 33.2 - MAKE CONNECTIONS Many new animal body plans...Ch. 33.3 - Prob. 1CCCh. 33.3 - Prob. 2CCCh. 33.3 - MAKE CONNECTIONS Explain how the molluscan foot...Ch. 33.4 - Prob. 1CCCh. 33.4 - Describe two adaptations that have enabled insects...
Ch. 33.4 - MAKE CONNECTIONS Historically, annelids and...Ch. 33.5 - Prob. 1CCCh. 33.5 - WHAT IF? The insect Drosophila melanogaster and...Ch. 33.5 - MAKE CONNECTIONS Describe how the features and...Ch. 33 - Lacking tissues and organs, how do soonges...Ch. 33 - Describe the cnidarian body plan and its two major...Ch. 33 - is the lophotrochozoan clade united by unique...Ch. 33 - Describe some ecological roles of nematodes and...Ch. 33 - You've read that echinoderms and chordates are...Ch. 33 - A land snail, a clam and an octopus all share...Ch. 33 - Prob. 2TYUCh. 33 - The water vascular system of echinoderms (A)...Ch. 33 - Prob. 4TYUCh. 33 - In Figure 33.2, which two main clades branch from...Ch. 33 - Prob. 6TYUCh. 33 - Evolution connection Interpret thf data Draw a...Ch. 33 - Prob. 8TYUCh. 33 - Prob. 9TYUCh. 33 - SYNTHESIZE YOUR KNOWLEDGE Colleclively, do these...
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